Improvement in machines for turning bungs



2 Shets-$heet 1. E. GUNTHER. mom-NE- FOR TURNING BUNGS.

No.171 ,511. Patented Dec. 28, ms.

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Patented Dec. 28,1875.

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UNITED STATES PATENT QFFICE.

EDWARD GUNTHER, OFNEW YORK, NL Y.

IMPROVEMENT IN MACHINES FOR TURNING BUNGS.

Specification forming part of Letters Patent No. 171,51 1, dated December 28, 1875; application filed. October 28, 1875.

CASE B.

To all whom it may concern:

Be it known that I, EDWARD GiiNTHER, of the city of New York, in the county of New York and State .of New York, have invented tion:

Figure 1 represents a front view of my invention. Fig. 2 is a plan or top view of the same. Fig. 3 is an end view of the same. Fig.

4 is a detached side elevation of the cutting mechanism. Fig. 5 is a side View of a modi- I I fication.

Similar letters of reference indicate corresponding parts in all the figures.

This invention relates to a machine provided with a head and spindle stock, both of which are mounted in a rock-shaft that receives an oscillating motion by a cam and lever or other equivalent means. The cylindrical blanks for the bungs are fed to .the

' machine over an inclined trough provided at ally centered and fastened between the center and the trident or other device secured to the The head and spindle stocks are then moved in, and the blank is exposed to the cutting mechanism, composed principally of two knives, one of which serves to impart to the blank the requisite taper, while the other acts on the large end of the bung, and imparts to the samethe desired rounded or convex form. The beveling-knife is carried over the surface of the bung three times in succession, so as to impart to the same the desired finish, and as the bevelingknife moves from the large toward the small end of the bung, the rounding-knife is carried in from the circumference toward the center of the In the drawing, the letter A designates a bed-plate from which rise two standards, B,

that form the bearings for a rock-shaft, G. From this rock-shaft extend four arms, D D E E, Fig. 1. Thearms' D D form the head: stock, carrying a slide, F, which contains the center G while the arms E E form the stock for the spindle H, in the outer end of which is secured the trident or other equivalent device I, and which receives a rapid revolving motion by a belt passing round a pulley, J, that is mounted on said spindle. From the arm D of the head-stock D D extendsa tappet-arm, K,(best seen in Fig. 3,) the outer end of which is drawn, by means of a spring, L, against the surface of a cam, M. This cam is mounted on the end of an arbor, N, Fig. 2, which is geared together with a shaft, 0, Fig. 1, carrying a driving-pulley, P, so that said arbor N revolves slowly. The cam M is provided with a projecting nose, at, and as it revolves in the direction of the arrow marked on it in Fig. 3 the rock-shaft G is turned, and the head-stocks D D E E are carried in the position shown in said figure, bringing the center G and the spindle H in line with the axis of the blank, which rests in a concave support, Q.

The blanks are cut out in the form of cylinders, each of sufficient length for one bung, and they are fed to the machine over an inclined trough, R, to the discharge end of which is secured the concave support Q. This support, however, is not rigid, but it swings on a pivot, b, Fig. 3, and is held up by a spring, 0, so that the same can yield when the blank has been received between the head-stocks, and when said head-stocks recede to expose the blank to the action of the knives.

The blanks are automatically centered, and -secured between the two head-stocks in the following manner: Round the center slide F is wounda spring, d, which has atendency to drive the center toward the spindle. From the under side of said center slide extends a stud, 0, (see Fig. 1 and Fig. 2, in dotted lines,) and against this stud acts a lever, f, which has its fulcrum on a pivot, g, secured in a standard, S, that rises from the bed-plate. An oscillating motion is imparted to the lever f by a stud, h, secured in the hub of the cam M, or in any part which is rigidly fastened to the arbor N As this arbor revolves the stud h imparts to the lever f a motion in the direction of the arrow, marked near it in Fig. 2, and the center slide F is forced back against the action of its spring, and when the lever f is released by the stud h the slideF is driven in toward the spindle H. v The position of the stud h in relation to the cam M is such that the center slide F is released by the lever f just at the moment when the center-G arm K, and the head-stocks swing into the position shown in Figs. 1 and 2, thereby exposing the blank to the action of'the cutting mechanism. This mechanism consists essentiallyof a beveling-knife, i, and of a roundingknife, j. The beveling-knife is secured to arm K, which rises from an oblique shaft, 1, that has its bearings in standards rising from the bed-plate A. (See Figs. 1 and 2.) From this oblique shaft extends an arm, m, the upper end of which bears against a cam, a, mounted on the arbor N. As this cam revolves, an OS- cillating motion is imparted to the oblique shaft 1, and the knife '5 is caused to sweep over the revolving blank, and to impart to the same a beveled shape.

By referring to Fig. 3 it will be seen that the surface of the cam M presents three sec tions, op q, separated by two ridges s, and by the nose a, and the cam n is provided with three projections. (See Fig. 2.) While the end of the tappet-arm K bears on the section 0 of the cam M, the blank is roughed out, .then the ridge 1' acts on the tappet-arm K, and the blank is thrown back out of contact withthe knife, and at the same time the first projection of the cam n releases the arm m of the shaft 1, and as the end of this arm drops between the first and the second projection of said cam, the knife 6 is carried back to the large endof the blank. When the ridge r of the cam M has passed the end of the tappetarm K, said end drops upon the section 10 of the cam M, and since this section is somewhat lower than the section 0 the knife i takesa second cut, and finally a third or finishing cut is taken, while the tappet-arm K bears on the lowestsection q of the cam M. g In some cases two outs may be sufficient to finish the bun g. The tappet-arm K can be adjusted forbun gs of difi'erent bevels. (See Fig. 3.) The rounding-knife j is secured in one end of a lever, 17, which swings on a pivot, u, secured in a stationary bracket, '0, (see Figs. 2 and 4,) and the other end of the lever it connects, by a rod,

w, with a lug, w, projecting from the arm K which carries the bevelingknife 2'. (Best seen in Fig. 4.) As the beveling-knife is caused to traverse from the large toward the small end of the hung, the lever t is turned on its pivot, and the rounding-knife j is moved in toward the center of the spindle H, and since the lever t describes a section of a circle, the rounding-knife partakes ofthis motion, and the end of the bung is'rounded 0d. The beveling-knife '5, instead of being secured directly to the end of the arm K, may be fastened in a slide-rest, to which a traversing motion is imparted. by the arm K, as indicated in Fig. 5. i

I claim as my invention- 1. The center slide F. supported by oscillating head-stocks, in combination with an oscillating lever, f, and a cam, M, said parts op-. erating in respect to the spindle H, and stock E, as described, for the purpose of automatically centering and securing the blanks to be operated upon, and to release the same when the head-stocks are'in line with the axis of the blank, substantially as herein described.

2. In a machine for turning bungs, the leveler-knifet' upon the shaft l operated bythe cam '10, in combination with the slide F G and spindle H supported upon head-stocks, substantially as and for the purpose specified.

3. In a machine forturning bungs, thecombination of a rounding-knife, j, with a beveling-knife, i, when the same operate upon the bung-blank secured between a slide and a spindle mounted inoscillating stocks D D E E, substantially as and for the purpose described.

4. The cam M, provided with the sectionso p q, as described, in combination with the tappet-lever K and beveling-knife i, substantially as described.

5. The slide F, provided with a reacting spring, d, and with a stud, e, in combination with-the oscillating lever f and thestud h, as

herein shown, for the purpose specified.

. E. GUNTHER.

Witnesses:

ERNEST 0. WEBB, F. V. BRIESEN. 

